RF Signal Not Near Zero

So I have two test radios set up in this room for testing.

They are both set to WDS Bridge and are connected via MAC address.

They are EnGenius enh500's.

The signal on both of them is around .-40

I wonder why I cant get the signal close to 0 even with them in the same room?

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*** = *****(*.*) + ***** (****) + **.** = ***

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